Needle-valve injector.



lUNrrn Smarts VICTOR GRETTER, OF CHICAGO, ILLINOIS'.

NEEDLE-VALVE INJECTOR.

SPECIFICATION forming part of Letters Patent No. 693,645, dated February 18, 1902.

Application led May 3l, 1901.

Beit known that I, VICTOR GRETTER, a citizen of the United States, residingat Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Needle Valve Injectors, of which the following is a full, clear, and exact specification.

This invention relates to improvements in needle-valve injectors especially designed for supplying oil combined with steam or air to the fire-chambers of furnaces and which of necessity require quite a long needle-valve stem and which for obtaining the best results should at all times be centered with the discharge-orifice of the valve. Prior to myinvention these long-stem needle-valves have had their support confined at or near the outer end of the valvestem, and as a result that portion of the stem beyond this support carrying the needle-valve at the opposite extremity thereof becomes, by reason ofthe unsupported weight of the same, flexed or bent, so that the needle-valve when unseated does not center with its discharge-orifice, and in consequence the oil or other liquid strikes the side Walls of the discharge-orifice at an oblique angle and is not only retarded in its flow, but the desired pressure thereof is reduced by the resistance resulting from this deection from its passage in a straight line through the dis charge orifice or passage, as it should to obtain the best results, and, furthermore, the needle-valve in these prior structures in seating strikes one side of its seat in advance of the other and is not centered until sufficient force is employed on the valve-stem to force it against the other side wall of the discharge orifice or passage.

The object of my invention is to provide a simple and effective means for supporting,r the inner end of a long needle-valve stem in such a manner that the needleyalve of an injector will be permanentlyand rigidly centered with the discharge-orifice thereforand with its seat both when being seated and when unseated and by this means maintain a uniform discharge of oil around the point of the valve and through the discharge orifice or passage leading from the valve-chamber, and thereby insure a uniform supply of oil therefrom at a maximum pressure and with the least pos- Serial No. 62,485. (No model.)

sible resistance to the onward Iiow of the oil from the valve-chamber to its ultimate destination.

A further object is not only to so center a long-stem needle-valve, as `above set forth, but at the same time provide means for conducting the oil or other liquid to the valvechamber :freely and at a maximum pressure and in such a manner that the seating and unseating of the valve shall not be subjected to the pressure of the oil or other liquid.

A still further object is to utilize for centering the long-stem needle-valve of an injcctor a device for giving a whirl to the steam to be combined with the oil at the point of the discharge of the oil from the needle-valve discharge-oriice- With these ends in view my invention consists in certain features of novelty in the construction, combination, and arrangements of parts by which said objects and certain other objects hereinafter appearing are attained, all as fully described with reference to the accompanying drawings, and more particularly pointed out in the claims.

In the said drawings, Figure l illustrates a longitudinal section of a needle-valve device with the needle-valve and its stem shown in full lines; Fig. 2, a detailed perspective of the spiral or screw device employed in connection with the needle-valve as a centering support or bearing therefor and for producing a whirl in the steam to be combined with the oil immediately prior to its discharge from the needle-valve device. Fig. 3 is a detailed peris a transverse section on the line 4 4 of Fig. 1.

Similar letters of reference indicate like parts in the drawings.

A indicates the body or chamber portion, and B the nozzle, of an injector, the body portion of which is provided with an oil-chamber C and a steam-chamber D, which may be of any desired form or capacity.

Screwed or otherwise fitted into the inner Wall of the oil-chamber C is a tube, and connecting the said chamber is a tube E, which projects well toward but terminates before reaching the forward or inner end of the noz- '/.le and has screwed intosaid end a plug F, which is cored out to form a valve-chamber Gr and a discharge-orifice II, leading there spective view of the needle-valve, and Fig. 4.`

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from, but terminating short of the jet-orifice I of the nozzle B, the eored-out-portion of said plug F being screw-threaded rearward of the needle-valve chamber, as shown at F, to correspond with screw-threads on the needle- Valve, hereinafter described, and at a point rearward of its discharge-orifice with grooved or spiral wings J, centering the plug in and against the inner walls of the nozzle at a point rearward of the discharge-orifice of the plug and at the rear end of an angular chamber K between the forward end of the nozzle and said wings.

Passing through the front wall of the casting A, the chamber C, and the tube E is the long stem L of a needle-valve,which is of less diameter than the tube E and is centered therein, the centering of the needle-valve stem being provided for in the usual manner by bushings or plugs M and N in the forward end of the body of the injector and by providing the opposite end of the valve-stem with screwthreads O, corresponding with and Working in the screw-threads F of the plug.

The needle-valve P, which preferably is formed with the stem, projects beyond the screw-threaded portion thereof and has the usual cone-shaped point Q, which when the valve is closed seats against an angular shoulder R at the juncture between the dischargeorifice H and the valve-chamber G, the oilsupply from the chamber C through the annular chamber S between the valve-stem and the tube being conducted to the valve-chamber by means of grooves T of any number, but preferably on opposite sides'of the stem and valve, as clearly indicated in Fig. 4; the said grooves extending from a point in the valve-stem in the screwed portion thereof to a pointterminating next the end of the needle-valve, as clearly shown in Figs. l and 3.

By supporting the needle-valve stem at substaniially both extremities of its length it will be seen that a needle-valve may be permanently centered at all times and in any adjustment it may have and this however long it may be necessary to have the stem of the valve,and in this connection it is proper to add that my invention is not limited to the precise structure of the plug employed-as,

'forinstance,any ordinary form of lug between the nozzle and the plug will answer the saine purposes, so far as centering the valve is concerned, as do the spiral wings herein shown to be formed with the plug.

For any of the above instances the needlevalve may be centered with permanency and perfect accuracy.

The centering of the needle-valve in the manner described provides for acontinuouslyuniform supply of oil or other liquid around the point of the valve, and therefore with a pressure centering at the axis of the dischargeorifice H, and as a result the directing of the oil in a straighteline along and through said orifice and without the impinging of the oil at an oblique angle to said walls and the consequent-retarding or a resistance of the passage of the oil therethrough. Furthermore, this centering of the needle-valve, necessarily having long stems, provides for a more accurate seating of the valve and a closer and a more accurate adjustment of the valve and the discharge of oil from the valve-chamber than is possible when a valve is flexed, if it is centered, and in seating strikes one side of its seat before it can be fully seated.

Having thus described myinvention, what I claim as new therein, and desire to secure by Letters Patent, is-

1. An injector comprising in combination a body portion provided with chambers, a nozzle, a tube provided with a plug havinginternal screw-threads and a valve-seat, said tube and nozzle having between them a passage connecting one of said chambers with the outlet of the nozzle, a valve-stem passing through the tube and of a diameter providing an annular surrounding ,passage connecting the other chamber with the outlet of the nozzle and screw-thread ed in the plug, a needlevalve on the end of the stem opposing the seat in the plug, and grooves in the stem terminating next the point ofthe valve and forming passages connecting the passage surrounding the stem with the outlet of the plug when the valve is olf its' seat, substantially as described.

2. An injector comprising in combination a body portion,- a nozzle, a valve-stem, a needle-valve on the end thereof, a plug provided with an internal seat for the valve and secured to the tube, external spiral wings on the plug fitting the walls of the nozzle, screwthreads upon the valve-stem fitting said plug, and a grooved duct in the stem terminating next the point of the valve, said stem, tube, plug and nozzle having a common axis and of diameters respectively providing for annular passages between the stem and tube and the tube and the nozzle, substantially as ICC IIO 

